package nullby.common.utils;

import java.io.File;
import java.io.IOException;

import android.content.Context;
import android.os.Environment;

/**
 * Provides application storage paths
 * 
 * @author Sergey Bandysik (bandysik[at]gmail[dot]com)
 */
public final class StorageUtils {

	private static final String TAG = StorageUtils.class.getSimpleName();

	private static final String INDIVIDUAL_DIR_NAME = "weezby_voc";

	private StorageUtils() {
	}

	/**
	 * Returns application cache directory. Cache directory will be created on
	 * SD card <i>("/Android/data/[app_package_name]/cache")</i> if card is
	 * mounted. Else - Android defines cache directory on device's file system.
	 * 
	 * @param context
	 *            Application context
	 * @return Cache {@link File directory}
	 */
	public static File getCacheDirectory(Context context) {
		File appCacheDir = null;
		if (Environment.getExternalStorageState().equals(
				android.os.Environment.MEDIA_MOUNTED)) {
			appCacheDir = getExternalCacheDir(context);
		}
		if (appCacheDir == null) {
			appCacheDir = context.getCacheDir();
		}
		return appCacheDir;
	}

	/**
	 * Returns individual application cache directory (for only image caching
	 * from ImageLoader). Cache directory will be created on SD card
	 * <i>("/Android/data/[app_package_name]/cache/uil-images")</i> if card is
	 * mounted. Else - Android defines cache directory on device's file system.
	 * 
	 * @param context
	 *            Application context
	 * @return Cache {@link File directory}
	 */
	public static File getIndividualCacheDirectory(Context context) {
		File cacheDir = getCacheDirectory(context);
		File individualCacheDir = new File(cacheDir, INDIVIDUAL_DIR_NAME);
		if (!individualCacheDir.exists()) {
			if (!individualCacheDir.mkdir()) {
				individualCacheDir = cacheDir;
			}
		}
		return individualCacheDir;
	}

	/**
	 * Returns specified application cache directory. Cache directory will be
	 * created on SD card by defined path if card is mounted. Else - Android
	 * defines cache directory on device's file system.
	 * 
	 * @param context
	 *            Application context
	 * @param cacheDir
	 *            Cache directory path (e.g.: "AppCacheDir",
	 *            "AppDir/cache/images")
	 * @return Cache {@link File directory}
	 */
	public static File getOwnCacheDirectory(Context context, String cacheDir) {
		File appCacheDir = null;
		if (Environment.getExternalStorageState().equals(
				android.os.Environment.MEDIA_MOUNTED)) {
			appCacheDir = new File(Environment.getExternalStorageDirectory(),
					cacheDir);
		}
		if (appCacheDir == null
				|| (!appCacheDir.exists() && !appCacheDir.mkdirs())) {
			appCacheDir = context.getCacheDir();
		}
		return appCacheDir;
	}

	private static File getExternalCacheDir(Context context) {
		File dataDir = new File(new File(
				Environment.getExternalStorageDirectory(), "Android"), "data");
		File appCacheDir = new File(
				new File(dataDir, context.getPackageName()), "cache");
		if (!appCacheDir.exists()) {
			try {
				new File(dataDir, ".nomedia").createNewFile();
			} catch (IOException e) {
				CustomLog
						.logW(TAG,
								"Can't create \".nomedia\" file in application external cache directory",
								e);
			}
			if (!appCacheDir.mkdirs()) {
				CustomLog
						.logW(TAG, "Unable to create external cache directory");
				return null;
			}
		}
		return appCacheDir;
	}
}
